Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6277bf46f8f611c…

MALICIOUS

PDF

90.0 KB Created: 2021-08-15 18:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09b8642260faf9fcb27e1fd32a4341c0 SHA-1: 2e2df8aae6d8fcb95df3594c03849923d8d4a110 SHA-256: b6277bf46f8f611c665c02e052e0f9af8b8b908f3258c1530ab3dee6d0123efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, presenting numerous URLs that point to compromised CMS upload directories, likely intended to host and distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806c6f6ab6f---wusor.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759204a4bc2---nabakuxogopurovadazovagi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4769213a7dc053837d16d4370455125a/totufarewajutupamel.pdfIn PDF document text
    • http://ashioke.com/images/library/File/bevudixifawif.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4e054057738fb7f4a730982529f9b46d/dexujigaranizejukujisumes.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/62097272467.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/60179353585.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/13933100203.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/70ea608d52049d7cebede9beb626cd66/mixofewu.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/mamewet.pdfIn PDF document text
    • https://shiokerbau1.com/contents/files/24263789488.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/fujozokiwewunixidesiv.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39fcc99820---77241591087.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/1152727550.pdfIn PDF document text
    • http://jarosi.hu/files/file/vuwegosadanebof.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/99785949683.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9573a7afdf---17207313512.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/904950b64208b5f19e2ecd83a08233f4/woravo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8132ccd09146690fc81a1df50cf9cabb/96641337424.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ae0q8lbqco54680i8lm5s97vic/josugufivudavubegas.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/vadiramefimudupinubuvit.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/94073988599.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/2043028849.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/bazofotixono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=le+livre+apprendre+%C3%A0+lire+et+%C3%A9crire+l%27arabePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 10756 bytes
SHA-256: 38c1683bc53a48fb9560a26bf13b28dee48bb134847f7717999a75b97c32ad13
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 18248 bytes
SHA-256: cd04e8b2aa3fa5d3340ca2e5ce5634ebf15440a8cc6b2e6c247945a0e5e19c95
font_02_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 17568 bytes
SHA-256: 1da0c466901e56dad656cbaa75ce499918545058f742ba84f8ae5704ac773925
font_03_sfnt_off00013ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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